| 摘要 |
A roller drive unit includes a frame, a drive shaft rotatably mounted in the frame, and a gear mounted on the drive shaft for engaging a drive motor. A pivot support is mounted on the drive shaft and is pivotable from lower rest position to an upper working position. A drive roll is rotatably mounted on the pivot support, and an internal gear is attached to the drive roll. A drive gear is mounted on the drive shaft, and an intermediate gear is rotatably mounted in the pivot support and is engaged between the drive gear and the internal gear. A spring is connected for biasing the pivot support to the lower rest position.
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